Exodus 28:30

28:30 “You are to put the Urim and the Thummim into the breastpiece of decision; and they are to be over Aaron’s heart when he goes in before the Lord. Aaron is to bear the decisions of the Israelites over his heart before the Lord continually.

Exodus 28:36

28:36 “You are to make a plate of pure gold and engrave on it the way a seal is engraved: “Holiness to the Lord.”